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// +build gofuzz
package dhcpv4
import (
"fmt"
"reflect"
)
// Fuzz is the entrypoint for go-fuzz
func Fuzz(data []byte) int {
msg, err := FromBytes(data)
if err != nil {
return 0
}
serialized := msg.ToBytes()
// Compared to dhcpv6, dhcpv4 has padding and fixed-size fields containing
// variable-length data; We can't expect the library to output byte-for-byte
// identical packets after a round-trip.
// Instead, we check that after a round-trip, the packet reserializes to the
// same internal representation
rtMsg, err := FromBytes(serialized)
if err != nil || !reflect.DeepEqual(msg, rtMsg) {
fmt.Printf("Input: %x\n", data)
fmt.Printf("Round-trip: %x\n", serialized)
fmt.Println("Message: ", msg.Summary())
fmt.Printf("Go repr: %#v\n", msg)
fmt.Println("Reserialized: ", rtMsg.Summary())
fmt.Printf("Go repr: %#v\n", rtMsg)
if err != nil {
fmt.Printf("Got error while reserializing: %v\n", err)
panic("round-trip error: " + err.Error())
}
panic("round-trip different: " + msg.Summary())
}
return 1
}
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